That is what I see also.  I see Charon labelled as C and the remaining moons are labelled P2 (Nix), P3 (Hydra), P4 (Kerberos), and P5 (Styx).

By the way, if you see Guide 9.1 in the upper left corner of the Guide window and see 9.1 in the version list under the Help / About Guide window, you have Guide 9.1.  The current version is 10 July 2017.

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Tom Kunsitis - Richmond, Virginia USA